It's not at all uncommon for results to be inconsistent when having a pH test. People are often frustrated, because they have a really good day when they want to have a really bad day, so the pH monitor can get a record of what they're experiencing when they suffer.
When your esophagus is under attack with acid or bile, your body makes extra saliva in an effort to protect it. I don't think you need to worry about the change in PH...chances are the saliva is just mixing with whatever is coming up, be it acid, or bile.
Good luck with the rest of your test! Let us know how it goes and what you find out!
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”